Piper SARATOGA PA-32-301 Maintenance Manual page 114

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
CHART 2102. TROUBLESHOOTING (AIR CONDITIONER) (cont)
Gauge Indication
Probable Causes
Remedy
Low suction pressure.
(Evaporator not cold
enough) Suction gauge may
read a vacuum indicating
evaporator lacks re-
frigerant.
Undercharge of refrigerant.
Moisture freezing in expan-
sion valve. Valve will show
frost. Expansion valve inlet
screen clogged. Inoperative
expansion valve. Valve stuck
closed or capillary bulb has
lost its charge.
Add refrigerant. Install new
dryer. Evacuate and recharge.
Remove screen. Clean with
solvent and replace. Warm
capillary by holding in hand.
If suction pressure does not
charge, replace expansion
valve.
Restriction anywhere in
liquid line. Restriction will
show frost.
Locate restriction and repair.
High suction pressure.
Capillary bulb clamp loose
on suction line. Suction line
shows frost.
Clean contact surfaces of
suction line and cap bulb.
Tighten clamp.
Expansion valve not closing.
Evaporator flooded. Suction
line frosted to compressor.
Compressor drive belt
slipping.
Magnetic clutch slipping.
Leaking or broken com-
pressor valves.
Replace expansion valve.
Adjust belt tension.
Check electrical circuit for
correct voltage to clutch coil.
Clean clutch surfaces of oil.
Replace compressor.
21-52-00
Page 21-08
Revised: August 11, 1983
1E18